package network;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

public class TcpThreadEchoServer {
    private ServerSocket serverSocket = null;

    public TcpThreadEchoServer(int port) throws IOException {
        serverSocket = new ServerSocket(port);
    }
    public void start() throws IOException {
        System.out.println("服务器启动");
        while (true) {
            //由于TCP是有连接的,所以我们需要使用serverSocket的accept来接通(返回一个socket)
            //命名为clientSocket来进行后续与客户端交通
            Socket clientSocket = serverSocket.accept();
            Thread t = new Thread(() -> {
                processConnection(clientSocket);
            });
            t.start();
        }
    }
    private void processConnection(Socket clientSocket){
        System.out.printf("[%s:%d] 客服端建立连接!\n",clientSocket.getInetAddress().toString(),clientSocket.getPort());
        try(InputStream inputStream = clientSocket.getInputStream()){           //处理写的请求
            try(OutputStream outputStream = clientSocket.getOutputStream()){    //处理返回的请求
                Scanner scanner = new Scanner(inputStream);
                while (true) {
                    if(!scanner.hasNext()) {
                        System.out.printf("[%s:%d] 客户端断开连接!\n", clientSocket.getInetAddress().toString(), clientSocket.getPort());
                        break;
                    }
                    String request = scanner.next();
                    String response = process(request);
                    PrintWriter printWriter = new PrintWriter(outputStream);
                    printWriter.println(response);
                    printWriter.flush();
                    System.out.printf("[%s:%d] req:%s,resp:%s]\n",clientSocket.getInetAddress().toString(),clientSocket.getPort()
                            ,request,response);
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                clientSocket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    public String process(String request) {
        return request;
    }

    public static void main(String[] args) throws IOException {
        TcpThreadEchoServer tcpThreadEchoServer = new TcpThreadEchoServer(9090);
        tcpThreadEchoServer.start();
    }
}
